MB. ST. GrEOBGE MIYABT ON THE SKELETON OE THE PEIMATES. 
393 
The sigmoid curvature of the bone is more marked than in the great majority of 
forms; but some of the Cebidse and Nycticebinse are similar to him. 
The humerus is longer, as compared with the spine, than in the great bulk of the order ; 
but its relative length is exceeded in the Simiinse, Ateles, and Lagothfix — the Gorilla 
and Orang surpassing Man in this respect almost as much as he exceeds Perodicticus. 
The articular head looks much more inwards and less backwards than in any other 
Primate. The tuberosities do not quite rise to the summit of the head, thus differing 
from some ; but then in Lagothrix, Ateles, Simia, and Hylobates they do not rise as 
high as they do in Man. 
The bicipital groove extends about one-third down the bone, and is more marked than 
it generally is in the Simiinae, but much less so than it is in the lowest Simiidse. 
The supinator ridge is moderate in size, and much less developed than in the 
lower Simiidse and most Lemuroidea ; on the other hand, it is more developed than in 
Hylobates. 
The external condyle is a moderate process distinct from the capitellum, and, unlike 
its position in most Primates, looks forwards and backwards, as in the Simiinae, Ateles, 
and Indris. 
The projection of the ulnar ridge of the trochlea is again intermediate between other 
forms as to its extent. The same may be said of the distinctness of its radial ridge and 
the depth of the olecranal fossa ; but the musculo-spiral groove is more marked than in 
any other Primate. 
Hadius. — In absolute length the radius of Man is not only exceeded by that of the 
whole of the Simiinse (except the smallest Gibbons), but by that of the largest of the 
Cynocephali also. The diameters of its two extremities, however, are greater than in 
any other Primates, except Troglodytes and Simia. 
Its proportionate length to the spine is smaller than in almost all the Simiidse., 
It exceeds that, however, existing in the lower Cebidse, in Hapale, and in all the Lemu- 
roidea except Loris and Tarsius. 
Its proportion to the humerus is characteristic, being generally less than in any other 
Primate, and only approached by the Gorilla, Brachyurus, and Hapale. 
Its thickness, in relation to its length, is also extreme. 
The shaft is moderately curved, more so than in many Primates, but less so than in 
some others, e. g. the Gorilla, Cebus, Indris. 
The bicipital tubercle is as marked as in any of the Order. 
The ulnar margin is sharp, as in the lowest Simiidse, not rounded as in many others, 
e. g. Troglodytes. 
The ridge for the origin of the flexor sublimis digitorum is marked, thus differing from 
all but the lowest Simiidse and some Lemuroidea, e. g. Indris, Arctocebus. 
The excavation for the origin of the flexor longus pollicis is more marked than in 
most forms, as'is also the rough surface for the insertion of the pronator teres. 
The excavation for the origin of the extensores pollicis is again more marked than in 
